JP6528685B2 - Translucent material with adhesive layer and display device - Google Patents

Description

  The present invention relates to a transparent surface material with an adhesive layer and a display device.

  It is known that a transparent surface material provided with an adhesive layer is bonded to a display panel for the purpose of protecting the display surface of the display panel such as a liquid crystal display device or an organic electroluminescent display device. Hereinafter, an organic electroluminescence (Electroluminescence) display device is abbreviated as an organic EL display device. For example, Patent Document 1 below proposes a pressure-sensitive adhesive layer-carrying transparent surface material having a characteristic that air bubbles are unlikely to remain between the display panel and the pressure-sensitive adhesive layer when it is bonded to the display panel.

WO 2011/148990 specification

  2. Description of the Related Art In recent years, a use mode has been studied in which a display device is bonded to a shop window of a store, a wall glass of an office, or the like so that the display surface faces outward. According to this aspect, since the passerby can visually recognize the display through the glass from the outside of the store or the office, the display device can be used for a signboard, an advertisement or the like. However, when the display device described in Patent Document 1 is to be bonded to glass, an adhesive must be further disposed on the surface of the transparent surface material opposite to the side on which the adhesive layer is provided. In that case, it may be difficult to fix a display with respect to glass in addition to the pasting work of a display becoming troublesome. Also, the display quality may be degraded depending on the method of bonding. Furthermore, when pasting to wall surface glass etc., construction easiness, original state restoration ease, etc. are calculated | required.

  One aspect of the present invention provides a transparent surface material with a pressure-sensitive adhesive layer capable of fixing a display device as well as facilitating a bonding operation when bonding a display device to a transparent support such as a glass plate. Moreover, one aspect of this invention is provided with the transparent surface material with an adhesion layer, and provides the display apparatus excellent in the display quality.

A transparent surface material with an adhesive layer according to one aspect of the present invention comprises a transparent surface material having a first surface and a second surface, an edge portion of the first surface of the transparent surface material, and a second surface. A light shielding portion provided on at least one of the peripheral portions, a first adhesive layer provided on the first surface of the transparent surface material, and a second surface of the transparent surface material A second adhesive layer provided in a formation area of an area smaller than the formation area of the first adhesive layer, and viewed from the normal direction of the first surface, the second adhesion The edge of the layer is located inside the edge of the first adhesive layer and overlaps the light shielding portion .

In the pressure-sensitive adhesive layer-carrying transparent surface material according to one aspect of the present invention, the first pressure-sensitive adhesive layer is preferably provided on the entire surface of the first surface of the transparent surface material.
In the transparent surface material with an adhesive layer according to one aspect of the present invention, the shear modulus of elasticity of the first adhesive layer and the second adhesive layer is preferably 10 ² to 10 ⁵ Pa.
In the transparent surface material with an adhesive layer according to one aspect of the present invention, the transparent surface material may be a glass plate.
In the pressure-sensitive adhesive layer-carrying transparent surface material according to one aspect of the present invention, the thickness of the transparent surface material may be more than 0.2 mm and 2.0 mm or less.
In the pressure-sensitive adhesive layer-attached transparent surface material according to one aspect of the present invention, the thickness of each of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer may be 0.2 to 2.0 mm.

The display device according to one aspect of the present invention comprises a transparent surface material with an adhesive layer, a transparent support bonded to the first surface of the transparent surface material with the adhesive layer, and the first transparent surface material with the adhesive layer. A display device body bonded to the second surface, and the transparent surface material with the adhesive layer has a transparent surface material having a first surface and a second surface, and the first of the transparent surface materials A light shielding portion provided on at least one of the peripheral portion of the surface and the peripheral portion of the second surface; a first adhesive layer provided on the first surface of the transparent surface material; and the transparent A second adhesive layer provided on the second surface of the face material and provided in a formation area of a smaller area than the formation area of the first adhesive layer, and the transparent support is the first support through the adhesive layer stuck to the transparent surface material, wherein the display device main body is stuck to the transparent surface material through said second adhesive layer, wherein the first When viewed from the normal direction, the edge of the second adhesive layer is positioned inside the edge of the first adhesive layer, and overlaps with the light-shielding portion.

In the display device according to one aspect of the present invention, the interfacial adhesion between the first adhesive layer and the transparent support, and the first adhesive layer and the transparent surface member is different from the second adhesive layer and the display. It is preferable that the adhesion strength between the apparatus main body and the interface between the second adhesive layer and the transparent surface material 2 be larger.
In the display device according to one aspect of the present invention, the interfacial adhesion between the first adhesive layer and the transparent support is smaller than the interfacial adhesion between the first adhesive layer and the transparent surface material. preferable.
In the display device according to one aspect of the present invention, a supporting member is fixed to a region other than the region where the second adhesive layer is formed on the second surface of the transparent surface material, and supports a portion of the display device body. It is preferable to further include.
In the display device according to one aspect of the present invention, the light shielding portion may be provided on the first surface of the transparent surface material, and the support member may be fixed to the second surface of the transparent surface material. .
In the display device according to one aspect of the present invention, the light shielding portion may be provided on the second surface of the transparent surface material, and the support member may be fixed to the light shielding portion.
In the display device according to one aspect of the present invention, the transparent support may be one selected from window glass, wall glass, and glass partition.
In the display device according to one aspect of the present invention, the entire area of the image display area in the display device main body may be bonded to the transparent surface material through the second adhesive layer.

  According to one aspect of the present invention, there is provided a transparent surface material with an adhesive layer that can facilitate the bonding operation when bonding a display device to a transparent support such as a glass plate, and can fix the display device. . According to one aspect of the present invention, a display device provided with a transparent surface material with an adhesive layer and excellent in display quality is provided.

It is a top view of the transparent surface material with the adhesion layer of 1st Embodiment. It is sectional drawing which follows the A-A 'line | wire of FIG. It is sectional drawing of a display apparatus containing the transparent surface material with the adhesion layer of 1st Embodiment. It is an expanded sectional view of B part of FIG. It is sectional drawing of the transparent surface material with the adhesion layer of 2nd Embodiment. It is sectional drawing of the display apparatus containing the transparent surface material with the adhesion layer of 2nd Embodiment.

First Embodiment
Hereinafter, a first embodiment of the present invention will be described using FIGS. 1 to 4.
In each of the following drawings, in order to make each component easy to see, the scale of dimensions may be shown differently depending on the component.

  In the present specification, "transparent" means that all or a part of the display image of the display main body is optically distorted after the face material and the display surface of the display main body are bonded without a gap through the adhesive layer. It means an aspect that can be viewed through the face material with little acceptance. Therefore, even if the surface material absorbs or reflects a part of light incident on the surface material from the display device main body, or the visible light transmittance of the surface material is low due to an optical phase change, etc. If it is possible to visually recognize the image of the display main body with little optical distortion through the material, it can be said to be "transparent.

<Transparent surface material with adhesive layer>
FIG. 1: is a top view of the transparent surface material 1 with the adhesion layer of 1st Embodiment. FIG. 2 is a cross-sectional view taken along the line AA 'of FIG.
As shown in FIG. 2, the transparent surface material 1 with an adhesive layer of the first embodiment has a transparent surface material 2 having a first surface 2 a and a second surface 2 b, a light shielding portion 3, and a first adhesive layer 4. , The second adhesive layer 5, the first protective film 6, and the second protective film 7. The light shielding portion 3 is provided at the peripheral portion of the second surface 2 b of the transparent surface material 2. The first adhesive layer 4 is provided on the first surface 2 a of the transparent surface material 2. The second adhesive layer 5 has a smaller formation area than the first adhesive layer 4, and is provided on the second surface 2 b of the transparent surface material 2.

(Transparent material)
The transparent surface material 2 is a core material of the transparent surface material 1 with the adhesive layer, and is a plate-like member interposed between the display device and the transparent support when the display device main body described later is bonded to the transparent support. is there. Examples of the transparent surface material 2 include a glass plate, a resin plate and the like. A transparent surface material from the viewpoint of having high light resistance, low birefringence, high plane accuracy, surface scratch resistance, and high mechanical strength, as well as being highly transparent to light emitted from the display device and reflected light. It is most preferable to use a glass plate as 2. The use of a glass plate is also preferable from the viewpoint of having a high transmittance to light for curing the photocurable resin composition constituting the first adhesive layer 4 and the second adhesive layer 5 as the transparent surface material 2.

  Examples of the glass plate include glass materials such as soda lime glass. Furthermore, as the glass plate, high-permeability glass with lower iron content and less bluish (commonly referred to as white sheet glass) is more preferable. In order to enhance the safety, tempered glass may be used as a surface material. In particular, when using a thin glass plate, it is preferable to use a chemically strengthened glass plate. When the transparent surface material 2 is bonded to the transparent support via the first adhesive layer 4, the whole or a part of the transparent surface material 2 may be curved. It is preferable to use a glass plate to which chemical strengthening has been applied also in view of preventing corrosion. Examples of the resin plate include highly transparent resin materials such as polycarbonate and polymethyl methacrylate.

  The transparent face material 2 may be subjected to surface treatment to improve the interfacial adhesion with the first adhesive layer 4 and the second adhesive layer 5. As a method of surface treatment, for example, a method of treating the surface of the transparent face material 2 with a silane coupling agent, a method of forming a silicon oxide thin film by an oxidation flame with a flame burner, etc. may be mentioned.

  The shape of the transparent surface material 2 may be determined in accordance with the planar shape of the display device main body to be bonded, and as shown in FIG. The thickness of the transparent surface material 2 is preferably about 0.2 to 2.0 mm in the case of a glass plate from the viewpoint of mechanical strength, transparency and the like. The thickness of the transparent surface material 2 is more preferably about 0.2 to 0.7 mm so as not to make the viewer feel strongly that the display looks deep (i.e., a sense of depth). If it is a resin plate, as for the thickness of the transparent surface material 2, about 0.1-1.0 mm is preferable. The thickness of the transparent surface material 2 is more preferably about 0.1 to 0.3 mm in order to prevent the viewer from feeling the sense of depth of display strongly.

(Light blocking part)
The light shielding portion 3 is a flexible printed wiring connected to the display device main body such that the region other than the image display region of the display device main body (that is, the region outside the image display region) is not visible when the display device main body is bonded. It hides wiring members such as boards. In the case of the present embodiment, the light shielding portion 3 is provided on the second surface 2 b which is the surface on the side to which the display device main body is bonded, of the two surfaces 2 a and 2 b of the transparent surface material 2. As shown in FIG. 1, the light shielding portion 3 is formed in a frame shape at the peripheral edge along the four sides of the rectangular transparent surface material 2 as viewed in the normal direction of the transparent surface material 2 as shown in FIG. There is. The opening area inside the light shielding portion 3 substantially coincides with the image display area of the display body when the display body is bonded.

  When the transparent surface material 2 is a glass plate, it is preferable to form the light shielding portion 3 by using a printing method such as ceramic printing containing a black pigment because the light shielding property is high. In the case where a chemically strengthened glass plate is used as the transparent surface material 2, the baking temperature of the transparent surface material 2 at the time of printing can be lowered by using an organic material as the light shielding ink. However, the light shielding portion 3 may not necessarily be formed by the printing method. For example, the light shielding portion 3 and the transparent surface material 2 which are separately prepared may be bonded. In addition, the light shielding part 3 can be formed using various thin film formation methods and surface modification processing methods of a transparent surface material.

(First adhesive layer)
The 1st adhesion layer 4 is for bonding the transparent support material 1 with an adhesion layer, for example with transparent supports, such as window glass. The first adhesive layer 4 is provided on the first surface 2 a of the two surfaces 2 a and 2 b of the transparent surface material 2, which is the surface to be bonded to the transparent support. Although the 1st adhesion layer 4 may be provided in a part of 1st surface 2a of the transparent surface material 2, it is preferable to be provided in the whole area of the 1st surface 2a. The reason is that, when the first adhesive layer 4 is provided on the entire area of the first surface 2a, the adhesive layer-carrying transparent surface material 1 is firmly bonded to the transparent support and the first adhesive layer This is because the boundary between the area where 4 exists and the area where it does not exist is difficult to see. The first adhesive layer 4 is made of a transparent resin obtained by curing a liquid photocurable resin composition described later. A touch sensor (not shown) may be provided between the transparent surface material 1 and the first adhesive layer 4.

The shear modulus of the first adhesive layer 4 is preferably in the range of 10 ² to 10 ⁵ Pa, and more preferably in the range of 10 ³ to 10 ⁴ Pa. If the shear modulus of elasticity of the first adhesive layer 4 is 10 ² Pa or more, it is easy to maintain the shape of the first adhesive layer 4. In addition, if the shear modulus of the first adhesive layer 4 is 10 ² Pa or more, the transparent surface material 2 and the member attached to the second adhesive layer 5 of the transparent surface material 2 can be used as the transparent support When bonding the transparent surface material 1 with the pressure-sensitive adhesive layer to a transparent support, the first pressure-sensitive adhesive layer 4 is preferable because it is difficult to be deformed by pressure or the like at the time of bonding. On the other hand, if the shear modulus of the first adhesive layer 4 is 10 ⁵ Pa or less, even if air bubbles are generated during bonding of the transparent surface material 1 with the adhesive layer to the transparent support, the air bubbles are generated in a short time It is preferable because it disappears and hardly remains.

  About 0.1-2.0 mm is preferable, and, as for the thickness of the 1st adhesion layer 4, about 0.2-0.8 mm is more preferable. If the thickness of the first adhesive layer 4 is 0.1 mm or more, the first adhesive layer 4 can effectively buffer an impact or the like due to an external force from the transparent support side, and the display device main body can be protected. In addition, even if a foreign substance not exceeding the thickness of the first adhesive layer 4 is mixed between the transparent support and the transparent surface material 1 with the adhesive layer, the thickness of the first adhesive layer 4 largely changes. And there is little impact on light transmission performance. If the thickness of the first adhesive layer 4 is 2.0 mm or less, it is easy to bond the transparent surface material 2 to the transparent support via the first adhesive layer 4 and the entire thickness of the display device is unnecessary. Not thick.

  The photocurable resin composition as a raw material of the first adhesive layer 4 is a photocurable curable compound (II), a photopolymerization initiator (C2), and, if necessary, a non-curable oligomer (D) A liquid composition containing The non-curable oligomer (D) is an oligomer having a hydroxyl group which does not cause a curing reaction with the curable compound (II) in the composition when the photocurable resin composition is cured.

(Curable compound (II))
The curable compound (II) in the photocurable resin composition is composed of one or more of a curable compound which causes a curing reaction when the photocurable resin composition is cured. At least one kind of the curable compound is a compound (IIa) having a hydroxyl group which does not react at the time of curing of the photocurable resin composition. When the curable compound (II) contains the compound (IIa), a hydroxyl group is present in the cured product obtained by curing reaction of the curable compound (II) alone. The presence of the hydroxyl group contributes to the stabilization of the non-curable oligomer in the photocurable resin composition. Therefore, the compound (IIa) having a hydroxyl group which does not react at the time of curing may be any compound having an unreacted hydroxyl group after the curing reaction, for example, even when a part of the hydroxyl groups of compound (IIa) cures, It is sufficient if it remains in an unreacted state without curing reaction.

  The compound (IIa) having a hydroxyl group which does not react at the time of curing may be any one having a hydroxyl group as well as having a curable group contributing to the curing reaction, and may be a monomer or an oligomer having a repeating unit Good. It is preferable to use a monomer having a curable group and having a hydroxyl group as the compound (IIa) from the viewpoint of easily adjusting the viscosity of the photocurable composition when it is not cured.

  The curable compound (II) has a curable group and has one or more of an oligomer (A ') having a number average molecular weight of 1,000 to 100,000, and a curable group, and has a molecular weight of 125 to 600. It is preferable to contain one or more of certain monomers (B '). When this kind of curable compound (II) is used, it is easy to adjust the viscosity of the photocurable resin composition to a preferable range. In this case, it is preferable to use a monomer (B3) having a curable group and a hydroxyl group and having a molecular weight of 125 to 600 as at least a part of the monomer (B ').

  Examples of the curable group of the oligomer (A ') or the monomer (B') include addition polymerizable unsaturated groups (such as acryloyloxy and methacryloyloxy groups) and combinations of unsaturated groups and thiol groups. Among them, at least one group selected from the group consisting of an acryloyloxy group and a methacryloyloxy group is preferable from the viewpoint of a high curing speed and a high transparency of the first adhesive layer 4.

  The curable group in the oligomer (A ') and the curable group in the monomer (B') may be the same as or different from each other. The curable group in the relatively high molecular weight oligomer (A ') tends to be less reactive than the curable group in the relatively low molecular weight monomer (B'). Therefore, the curing of the monomer (B ') proceeds and the viscosity of the whole composition is rapidly increased, and the curing reaction may be inhomogeneous. In order to reduce the difference in reactivity between the two curable groups and obtain a homogeneous first adhesive layer 4, the curable group of the oligomer (A ′) is made a relatively reactive acryloyloxy group, and the monomer ( More preferably, the curable group of B ') is a relatively low-reacting methacryloyloxy group. In order to shorten the time required for the curing reaction or to increase the adhesion of the first adhesive layer 4, both the curable groups of the oligomer (A ') and the monomer (B') should be acryloyloxy groups. Is preferred.

(Oligomer (A '))
The number average molecular weight of the oligomer (A ′) is 1,000 to 100,000, and preferably 10,000 to 70,000. It is easy to adjust the viscosity of a photocurable resin composition to the said range as the number average molecular weight of an oligomer (A ') is this range. The number average molecular weight of the oligomer (A ′) is a polystyrene-equivalent number average molecular weight obtained by measurement of GPC. In addition, in the measurement of GPC, when the peak of the unreacted low molecular weight component (monomer etc.) appears, a peak is remove | excluded and a number average molecular weight is calculated | required.

  As the oligomer (A ′), one having an average of 1.8 to 4 curable groups per molecule is preferable from the viewpoint of the curability of the photocurable resin composition and the mechanical properties of the first adhesive layer 4 . As an oligomer (A '), the urethane oligomer which has a urethane bond, the poly (meth) acrylate of polyoxyalkylene polyol, or the poly (meth) acrylate of polyester polyol etc. are mentioned. The urethane oligomer (A2) is preferable in that the mechanical properties of the cured resin, the adhesion to the facing material, and the like can be widely adjusted by the molecular design of the urethane chain and the like.

  The urethane oligomer (A2) is preferably one synthesized by a method of reacting a monomer (B2) with an isocyanate group of a prepolymer after reacting a polyol and a polyisocyanate to obtain a prepolymer having an isocyanate group. Examples of the polyol or polyisocyanate include known compounds such as polyol (i) or diisocyanate (ii) described as a raw material of urethane oligomer (a) described in WO 2009/016943 pamphlet. , Incorporated herein.

  The content ratio of the oligomer (A ′) is 20 to 90 of the total (100% by mass) of the curable compound (II), that is, the total (100% by mass) of the oligomer (A ′) and the monomer (B ′) % By mass is preferable, and 30 to 80% by mass is more preferable. The heat resistance of the 1st adhesion layer 4 becomes favorable for the ratio of an oligomer (A ') to be 20 mass% or more. When the proportion of the oligomer (A ') is 90% by mass or less, the curability of the photocurable resin composition and the adhesion between the transparent surface material 2 and the first adhesive layer 4 become good.

(Monomer (B '))
The molecular weight of the monomer (B ') is 125 to 600, preferably 140 to 400. When the molecular weight of the monomer (B ′) is 125 or more, volatilization of the monomer can be suppressed when the first pressure-sensitive adhesive layer 4 is formed using a pressure reduction means. The adhesiveness of the transparent surface material 2 and the 1st adhesion layer 4 becomes favorable for the molecular weight of a monomer (B ') to be 600 or less. From the viewpoint of the curability of the photocurable resin composition and the mechanical properties of the first adhesive layer 4, the monomer (B ′) preferably has 1 to 3 curable groups per molecule. The content ratio of the monomer (B ′) is 10 to 80 of the total (100% by mass) of the curable compound (II), that is, the total (100% by mass) of the oligomer (A ′) and the monomer (B ′). % By mass is preferable, and 20 to 70% by mass is more preferable.

  It is preferable that a monomer (B ') has a curable group and contains the monomer (B3) which has a hydroxyl group. The monomer (B3) contributes to the stabilization of the non-curable oligomer (D). Moreover, when the monomer (B3) is contained, good adhesion between the transparent surface material 2 and the first adhesive layer 4 can be easily obtained. As a monomer (B3) which has a hydroxyl group, 2-hydroxy butyl methacrylate or 4-hydroxy butyl acrylate is especially preferable. The content ratio of the monomer (B3) is 10 to 60 mass of the whole (100 mass%) of the curable compound (II), that is, the total (100 mass%) of the oligomer (A ′) and the monomer (B ′) % Is preferable and 20-50 mass% is more preferable. When the content ratio of the monomer (B3) is 10% by mass or more, the effects of improving the stability of the photocurable resin composition and improving the adhesion between the transparent surface material 2 and the first adhesive layer 4 are sufficiently obtained. It is easy to be

  The monomer (B ') preferably contains the following monomer (B4). When the content of the monomer (B4) is larger than the content of the monomer (B3) having a hydroxyl group in mass ratio, after bonding the display main body and the adhesive layer provided transparent surface material 1 in a reduced pressure atmosphere, When this is returned to the atmospheric pressure atmosphere, the time until the bubbles generated in the first adhesive layer 4 disappear tends to be short. On the other hand, when the monomer (B4) is contained, the time required for curing of the photocurable resin composition tends to be long.

  A monomer (B4) is comprised by 1 or more types chosen from the group which consists of an alkyl acrylate which has a C8-C22 alkyl group, and an alkyl methacrylate. Examples of the monomer (B4) include n-decyl acrylate, n-dodecyl acrylate, n-dodecyl methacrylate, isooctadecyl acrylate, n-octadecyl methacrylate, n-behenyl methacrylate and the like, and n-dodecyl acrylate or n-dodecyl methacrylate Or n-octadecyl methacrylate is preferred. The content ratio of the monomer (B4) is 5 to 50% of the total (100% by mass) of the curable compound (II), that is, the total (100% by mass) of the oligomer (A ') and the monomer (B') % Is preferable and 15-40 mass% is more preferable. When the content ratio of the monomer (B4) is 5% by mass or more, a sufficient addition effect of the monomer (B4) can be easily obtained.

(Photoinitiator (C2))
As a photopolymerization initiator (C2) contained in a photocurable resin composition, photopolymerization initiation, such as acetophenone type, ketal type, benzoin or benzoin ether type, phosphine oxide type, benzophenone type, thioxanthone type, or quinone type, is started. Agents are preferred, and phosphine oxide type or thioxanthone type photopolymerization initiators are preferred, and in view of suppressing coloration after photopolymerization reaction, phosphine oxide type is particularly preferred. When performing photopolymerization reaction by high intensity light irradiation, it is preferable to use an acetophenone photopolymerization initiator because the curing speed can be increased. The content of the photopolymerization initiator (C2) in the photocurable resin composition is the entire curable compound (II), that is, 100 parts by mass in total of the oligomer (A ′) and the monomer (B ′). 0.01-10 mass parts is preferable, and 0.1-5 mass parts is more preferable.

(Non-curable oligomer (D))
The non-curable oligomer (D) is an oligomer having a hydroxyl group which does not cause a curing reaction with the curable compound (II) in the composition when the photocurable resin composition is cured. The number of hydroxyl groups per molecule of the non-curable oligomer (D) is preferably 0.8 to 3, and more preferably 1.8 to 2.3. The number average molecular weight (Mn) per hydroxyl group of the non-curable oligomer (D) is preferably 400 to 8,000. When the number average molecular weight per hydroxyl group is 400 or more, the polarity of the non-curable oligomer (D) does not become too high, and good compatibility with the curable compound (II) in the photocurable resin composition Is easy to obtain. If the number average molecular weight per hydroxyl group is 8000 or less, the interaction between the hydroxyl group derived from the curable compound (II) and the hydroxyl group of the non-curable oligomer (D) causes the non-curable oligomer after curing The effect of stabilizing (D) is easily obtained. It is speculated that the interaction involves hydrogen bonding. The non-curable oligomers (D) may be used alone or in combination of two or more.

  Examples of the non-curable oligomer (D) containing a hydroxyl group include high molecular weight polyols and the like, and polyoxyalkylene polyols, polyester polyols or polycarbonate polyols are preferable. Examples of polyoxyalkylene polyols include polyoxyalkylene diols such as polyoxyethylene glycol, polyoxypropylene diol, polyoxypropylene triol, and polyoxytetramethylene glycol.

  400-8000 are preferable and, as for the number average molecular weight (Mn) per hydroxyl group of polyoxyalkylene polyol, 600-5000 are more preferable. As polyester polyol, aliphatic having residue of aliphatic diol such as ethylene glycol, propylene glycol or 1,4-butanediol and residue of aliphatic dicarboxylic acid such as glutaric acid, adipic acid or sebacic acid And polyester polyester diols. The polycarbonate polyol may, for example, be an aliphatic polycarbonate diol having a diol residue such as 1,6-hexanediol or an aliphatic polycarbonate diol such as a ring-opening polymer of an aliphatic cyclic carbonate.

400-8000 are preferable and, as for the number average molecular weight (Mn) per hydroxyl group of polyester polyol or polycarbonate polyol, 800-6000 are more preferable. The number average molecular weight of the non-curable oligomer (D) in the present specification is 1 molecule of hydroxyl value A (KOH mg / g) measured according to JIS K 155-1 (2007 edition) and non-curable oligomer (D) It is a value calculated by the following formula (1) from the number B of hydroxyl groups in the inside.
Molecular weight of non-curable oligomer (D) = 56.1 × B × 1000 / A (1)

  From the viewpoint that the elastic modulus of the first adhesive layer 4 after curing tends to be lower, it is preferable to use a polyoxyalkylene polyol as the non-curable oligomer (D), and a polyoxypropylene polyol is particularly preferable. In addition, a part of the oxypropylene group of the polyoxypropylene polyol may be substituted with an oxyethylene group. For example, in view of compatibility, the oligomer (A ') is a urethane oligomer synthesized using polyoxyalkylene polyol and polyisocyanate as raw materials, and the non-curable oligomer (D) is polyoxyalkylene polyol. preferable.

  In the present embodiment, the oligomer (A ′) is used to stabilize the uncured photocurable resin composition and to suppress separation of the non-curable oligomer (D) from the first adhesive layer 4 after curing. And the non-curable oligomer (D) preferably have molecular chains of the same or similar structure. Specifically, as a raw material for synthesizing the oligomer (A ') in the photocurable resin composition, a compound having a hydroxyl group such as a polyol (hereinafter sometimes referred to as a hydroxyl group-containing compound) is used, and the same. It is preferable to use a hydroxyl group-containing compound as the non-curable oligomer (D). For example, when the oligomer (A ') is a urethane oligomer synthesized using polyoxyalkylene polyol and polyisocyanate as raw materials, it is preferable to use the polyoxyalkylene polyol as the non-curable oligomer (D).

  Alternatively, when the hydroxyl group-containing compound as a raw material of the oligomer (A ′) and the hydroxyl group-containing compound used as the non-curable oligomer (D) are not identical, the molecular chains of both have common repeating units, etc. It is preferable to have a common structure and to make the polarities of both the same. The method of adjusting the polarity is, for example, a method of raising the polarity by introducing a polar group, a method of raising the polarity by substituting a part of the oxypropylene group with an oxyethylene group, or reducing the molecular weight per hydroxyl group. There is a method of increasing the polarity and the like. These methods may be used in combination.

  For example, when the oligomer (A ′) is a urethane oligomer synthesized using polyoxypropylene polyol (a ′) in which a part of oxypropylene group is substituted with oxyethylene group and polyisocyanate as a raw material, oxyethylene group It is preferable to use, as the non-curable oligomer (D), a polyoxypropylene polyol which does not have a lower molecular weight per hydroxyl group than that of the polyol (a ′).

  As an example of the most preferable photocurable resin composition, after a polyoxypropylene diol in which a part of the oxypropylene group is substituted with an oxyethylene group and a polyisocyanate compound are reacted to obtain a prepolymer having an isocyanate group, A polyoxypropylene comprising a urethane oligomer (A2) obtained by reacting with a monomer (B2) as an oligomer (A ′), and in which the same oxypropylene group as in the raw material of the urethane oligomer (A2) is substituted with an oxyethylene group A composition containing a diol as a non-curable oligomer (D) and a monomer (B3) having a hydroxyl group as the monomer (B ′) can be mentioned.

  Thus, when the oligomer (A ') partially has the same molecular structure as the non-curable oligomer (D), the compatibility of the non-curable oligomer (D) in the composition is further enhanced. Furthermore, when the monomer (B ') has a hydroxyl group, a cured product is obtained by the interaction between the hydroxyl group in the molecular structure of the curable compound (II) after curing and the hydroxyl group in the molecular structure of the non-curable oligomer (D). Among them, it is considered that the non-curable oligomer (D) can be stably present.

  As another example, after a polyoxypropylene diol in which a part of oxypropylene groups is substituted with an oxyethylene group and a polyisocyanate compound are reacted to obtain a prepolymer having an isocyanate group, it is then reacted with a monomer (B2) A polyoxypropylene diol which contains the urethane oligomer (A2) obtained as an oligomer (A ') and is not substituted with an oxyethylene group, and whose molecular weight is smaller than that of the raw material of the urethane oligomer (A2) Also in the composition containing as a non-curable oligomer (D) and containing a monomer (B3) having a hydroxyl group as the monomer (B '), good compatibility of the non-curable oligomer (D) in the composition can be obtained. Can be obtained, and the non-curable oligomer (D) is stably present in the cured product. Rukoto can.

  The non-curable oligomer (D) in the photocurable resin composition is transparent when it is returned to the atmospheric pressure atmosphere after laminating the transparent surface material 1 with the adhesive layer and the transparent support in the reduced pressure atmosphere. This contributes to shortening the time required for the bubbles formed at the interface between the support and the first adhesive layer 4 to disappear. When the content of the non-curable oligomer (D) in the photocurable resin composition is too small, the predetermined effect can not be obtained, and when too large, the curing of the first adhesive layer 4 may be insufficient. . If curing of the first adhesive layer 4 is insufficient, it may be difficult to peel off the first protective film 6 from the first adhesive layer 4 after curing. Therefore, the content of the non-curable oligomer (D) in the photocurable resin composition is in the range of 10 to 70% by mass with respect to the whole (100% by mass) of the photocurable resin composition. It is preferable to set in consideration of the balance with other components so as not to occur.

  For example, the photocurable resin composition contains a monomer (B3) having a hydroxyl group and a monomer (B4) having an alkyl group, and the monomer (B4) is contained with respect to 1 (mass basis) of the content of the monomer (B3). When the content of (C) is 0.6 to 2.5 and the chain transfer agent is not contained, the content of the non-curable oligomer (D) is within the total (100% by mass) of the photocurable resin composition. 30-70 mass% is preferable, and 40-70 mass% is more preferable.

  The chain transfer agent also contributes to shortening the time until the bubbles disappear. The photocurable resin composition contains the chain transfer agent in an amount of 1 part by mass or less based on 100 parts by mass of the entire curable compound (II), and the content of the monomer (B4) is higher than that of the monomer (B3) When the amount is small, the content of the non-curable oligomer (D) is preferably 40 to 70% by mass, and more preferably 50 to 70% by mass, based on the total of the layer-forming photocurable resin composition.

  The content of the monomer (B4) is 1 to 4 relative to the content (based on mass) of the monomer (B3), and the chain transfer agent is used relative to 100 parts by mass of the entire curable compound (II) The content of the non-curable oligomer (D) is preferably 5 to 55% by mass, and more preferably 10 to 50% by mass, based on the total weight of the photocurable resin composition, when contained in a range of 1 part by mass or less. And 20 to 40% by mass are more preferable. The addition of the monomer (B4) or the chain transfer agent tends to slow the curing rate, and therefore, the content is preferably as small as possible from this point. When the mass ratio of the content of the monomer (B4) is less than 0.6 with respect to the content (based on mass) of the content of the monomer (B3), and the chain transfer agent is not contained either, the non-curable oligomer (D) 40-70 mass% is preferable, and, as for content of (), 50-70 mass% is more preferable.

(Additive)
The photocurable resin composition may contain, as necessary, a polymerization inhibitor, a photocuring accelerator, and a chain transfer agent, in addition to the curable compound (II), the noncurable oligomer (D) and the photopolymerization initiator (C2). And various additives such as light stabilizers (ultraviolet absorbers, radical scavengers, etc.), antioxidants, flame retardants, adhesion improvers (silane coupling agents, etc.), pigments, dyes, etc. Preferably, it contains a polymerization inhibitor, a light stabilizer, or an antioxidant. In particular, by including a polymerization inhibitor in an amount smaller than that of the polymerization initiator, the stability of the photocurable resin composition can be improved, and the molecular weight of the layer portion after curing can be adjusted. In addition, the stability of the photocurable resin after curing can be enhanced by including an antioxidant. The total amount of these additives is preferably 10 parts by mass or less, and 5 parts by mass, based on 100 parts by mass of the entire curable compound (II), that is, the total of oligomer (A ') and monomer (B'). The following are more preferable.

Among the additives, the chain transfer agent is preferably not contained or is preferably contained in a small amount in order to obtain a good curing rate. When a chain transfer agent is contained, there is a tendency that the time taken for the bubbles generated at the time of bonding of the transparent support and the transparent surface material 1 with an adhesive layer to disappear becomes short, and the effect of causing the bubbles to disappear favorably The amount of the non-curable oligomer (D) required for the addition can be reduced. The amount of chain transfer agent added is preferably 1 part by mass or less based on 100 parts by mass of the entire curable compound (II), that is, the total of oligomer (A ') and monomer (B'), 0.5 parts by mass or less is more preferable.
As a method of forming the first adhesive layer using a photocurable resin composition, for example, a photocurable resin composition is photocured and then applied to a transparent surface material, or an uncured photocurable resin is used. The method of applying a composition to a transparent surface material and then photocuring it to form a first adhesive layer may, for example, be mentioned.

(Second adhesive layer)
The 2nd adhesion layer 5 is for bonding the transparent surface material 1 with an adhesion layer with a display apparatus main body. The second adhesive layer 5 is provided on the second surface 2 b of the two surfaces 2 a and 2 b of the transparent surface material 2, which is the surface to be bonded to the display device main body. The second adhesive layer 5 has a smaller formation area than the first adhesive layer 4. Specifically, while the first adhesive layer 4 is provided on the entire area of the first surface 2 a of the transparent surface material 2, the second adhesive layer 5 is provided on the second surface 2 b of the transparent surface material 2. Provided in some areas of the That is, the second surface 2 b of the transparent surface material 2 has a region where the second adhesive layer 5 is provided and a region where the second adhesive layer 5 is not provided.

  The constituent material of the second adhesive layer 5 may be the same as the constituent material of the first adhesive layer 4 or may be different from the constituent material of the first adhesive layer 4. Since the second adhesive layer 5 is bonded to the display panel of the display device, it is preferable that the second adhesive layer 5 can be bonded without leaving a void at a smaller bonding pressure so as not to adversely affect the display panel. For that purpose, the content of the non-hardening component in the curable compound is increased or the content of the chain transfer agent is adjusted. In addition, since external light transmitted through the first adhesive layer 4 and the transparent surface material 2 is incident on the second adhesive layer 5, even if the second adhesive layer 5 contains an ultraviolet absorber smaller than that of the first adhesive layer 4. Good. The thickness of the second adhesive layer 5 may be the same as the thickness of the first adhesive layer 4 or may be different from the thickness of the first adhesive layer 4. The shear modulus of the second adhesive layer 5 may be the same as the shear modulus of the first adhesive layer 4 or may be different from the shear modulus of the first adhesive layer 4. Since the second adhesive layer 5 is in direct contact with the display device, there is a possibility that the uniformity of the display image may be impaired in the application of the transparent surface material to the display surface as in the IPS mode liquid crystal display device. It is preferable to use a constituent material of the second pressure-sensitive adhesive layer 5 capable of forming a pressure-sensitive adhesive layer having a smaller elastic modulus, or to increase the thickness of the second pressure-sensitive adhesive layer 5.

  The second adhesive layer 5 extends over the region of the second surface 2 b of the transparent surface material 2 surrounded by the frame-shaped light shielding portion 3 and the region overlapping in plan with a part of the light shielding portion 3. Is provided. Since the second adhesive layer 5 is bonded to a portion corresponding to the image display area of the display device main body, the second adhesive layer 5 is provided only in the area surrounded by the light shielding portion 3, ie, the area inside the light shielding portion 3 It is also good. However, as in the present embodiment, when the second adhesive layer 5 planarly overlaps with a portion of the light shielding portion 3, the region where the second adhesive layer 5 planarly overlaps with a portion of the light shielding portion 3 is It functions as an alignment margin when aligning the second adhesive layer 5 and the light shielding portion 3. Therefore, even if the positional alignment between the second adhesive layer 5 and the light shielding portion 3 is slightly shifted, the second adhesive layer 5 is easily formed in the area surrounded by the light shielding portion 3. As a result, the display device main body is fixed to the transparent surface material 2 with sufficiently high strength, and the edge of the second adhesive layer 5 is hidden by the light shielding portion 3 and the display quality by the edge of the second adhesive layer 5 is visible Does not occur.

(First Protective Film and Second Protective Film)
The first protective film 6 and the second protective film 7 are for protecting the first pressure-sensitive adhesive layer 4 or the second pressure-sensitive adhesive layer 5 when not in use, and when in use, the first pressure-sensitive adhesive layer 4 or It is peeled off from the second adhesive layer 5. Therefore, it is required that the first protective film 6 and the second protective film 7 do not firmly adhere to the first adhesive layer 4 or the second adhesive layer 5. From this viewpoint, as the first protective film 6 and the second protective film 7, a group having relatively low adhesion to the first pressure-sensitive adhesive layer or the second pressure-sensitive adhesive layer made of polyethylene, polypropylene, or fluorocarbon resin. It is preferable to use a protective film that causes the material film to be in contact with the first adhesive layer 4 or the second adhesive layer 5.

  The adhesive force of the adhesive surface of the first protective film 6 and the second protective film 7 is 0.01 to 1 N in a 50 mm wide test body in a 180 degree peel test at a peel speed of 300 mm / min against an acrylic plate. Preferably, 0.02 to 0.6 N is more preferable. The preferred thickness of the first protective film 6 or the second protective film 7 varies depending on the resin used, but is 0.03 to 0.2 mm when using a relatively flexible film such as polyethylene or polypropylene. Preferably, 0.06 to 0.1 mm is more preferable. When the thickness is 0.03 mm or more, deformation of the protective film can be suppressed when peeling the protective film from the adhesive layer. When the thickness is 0.2 mm or less, the protective film is easily bent at the time of peeling and easily peeled.

  In order to further facilitate peeling from the first adhesive layer 4 and the second adhesive layer 5, the first adhesive layer 4 and the second adhesive layer may be formed on the first protective film 6 and the second protective film 7. A release agent such as silicone can also be applied as long as it does not adversely affect 5. In order to facilitate holding of the end portions of the first protective film 6 and the second protective film 7 at the time of peeling from the first adhesive layer 4 and the second adhesive layer 5, the first larger than the transparent surface material 2 It is preferable to use the protective film 6 and the second protective film 7.

(Display device)
FIG. 3 is a cross-sectional view of a display device including the pressure-sensitive adhesive layer-attached transparent surface material of the first embodiment. FIG. 4 is an enlarged cross-sectional view of a portion B of FIG. In addition, in order to make the backlight 17 part intelligible in FIG. 3, it has simplified and described.

  As shown to FIG. 3, FIG. 4, the display apparatus 10 of 1st Embodiment is provided with the display apparatus main body 11, the transparent surface material 1 with the adhesion layer, and the transparent support body 12. As shown in FIG. The transparent support 12 is bonded to the first surface 1 a of the pressure-sensitive adhesive layer-carrying transparent surface material 1 provided with the first pressure-sensitive adhesive layer 4. The display device main body 11 is bonded to the second surface 1 b of the transparent surface material 1 with an adhesive layer. In the first embodiment, the transparent support 12 is a window glass used, for example, in a store or office. The display device main body 11 is a liquid crystal display device. The pressure-sensitive adhesive layer-carrying transparent surface material 1 is obtained by peeling the first protective film 6 and the second protective film 7 from the pressure-sensitive adhesive layer-carrying transparent surface material 1 shown in FIG. The transparent surface material 2 is bonded to the transparent support 12 via the first adhesive layer 4. The display device main body 11 is bonded to the transparent surface material 2 via the second adhesive layer 5. In addition, you may use the transparent surface material 1 with the adhesion layer which provided the touch sensor (not shown) in the transparent support 12 side of the transparent surface material 2. FIG. In that case, the display device 10 can be operated by touching the transparent support 12 from the outside.

  As shown in FIG. 4, the display device main body 11 includes a liquid crystal panel 14, a pair of polarizing plates 15 and 16, a backlight 17 (illumination device), a frame 18, and a case 19. The liquid crystal panel 14 includes a pair of glass substrates 21 and 22 and a liquid crystal (not shown) sealed between the glass substrates 21 and 22. The driving method of the liquid crystal panel 14 is not particularly limited, and, for example, a liquid crystal panel of a horizontal electric field method such as In-Plane Switching can be mentioned. The pair of glass substrates 21 and 22 is composed of a TFT element substrate provided with thin film transistors (Thin Film Transistor, hereinafter abbreviated as TFT), and a color filter substrate provided with a color filter.

  The pair of polarizing plates 15 and 16 are bonded to both sides of the liquid crystal panel 14 so as to sandwich the liquid crystal panel 14. In addition, an optical film such as a retardation plate may be disposed between the polarizing plates 15 and 16 and the liquid crystal panel 14. Among the pair of polarizing plates 15 and 16, the liquid crystal panel 14 is transparent by bonding the polarizing plate 16 located on the opposite side to the backlight 17 to the transparent surface material 2 via the second adhesive layer 5. It is fixed to a support 12.

  The backlight 17 includes a light emitting element 23 such as a light emitting diode (LED), a light guide plate 24, and one or more optical films 25 such as a prism sheet and a light diffusion sheet as needed, and a mirror 26. Prepare. The light emitted from the light emitting element 23 is incident on the light guide plate 24 and is reflected by the mirror 26 while guiding light inside, and is emitted toward the liquid crystal panel 14 through the optical film 25. The optical film 25 has functions to make the intensity of the light emitted from the light guide plate 24 uniform, to change the viewing angle, and to improve the light utilization efficiency. Therefore, the optical film 25 and the liquid crystal panel 14 are disposed at intervals as needed.

  Since the liquid crystal panel 14 is relatively lightweight, the liquid crystal panel 14 is supported by the transparent support 12 only by bonding the portion of the image display area of the liquid crystal panel 14 to the transparent support 12 via the transparent surface material 1 with the adhesive layer. Ru. However, when the size of the liquid crystal panel 14 increases, the weight of the backlight 17 may increase. Even if the liquid crystal panel 12 and the backlight 17 are fixed, the liquid crystal panel 14 is attached to the transparent support 12 It may be difficult to support the entire display main body 11 on the transparent support 12 only by fitting. In such a case, it is preferable that the backlight 17 be supported by the transparent support 12 separately from the liquid crystal panel 14 among the components of the display device main body 11.

  In the case of the first embodiment, the back light 17 is fixed to the transparent surface material 1 with the adhesive layer by a support member 28 (angle) having an L-shaped cross section as a configuration for supporting the back light 17 on the transparent support 12. There is. In detail, the support member 28 for fixing the backlight 17 is fixed to the light shielding portion 3 on the second surface 2 b of the transparent surface material 2 by the double-sided adhesive tape 29. The back light 17 is fixed to the frame 18, and the frame 18 is fixed to the case 19. The case 19 is fixed to the support member 28 by bolts 30. With the above configuration, the backlight 17 is fixed to the transparent support 12 via the transparent surface material 1 with the adhesive layer.

  As a procedure for bonding the display device main body 11 to the transparent support 12, the first protective film 6 is peeled off from the transparent surface material 1 with adhesive layer, and the transparent surface material 1 with adhesive layer is bonded to the transparent support 12 Then, the second protective film 7 may be peeled off, and the display device main body 11 may be bonded onto the adhesive layer-attached transparent surface material 1 bonded to the transparent support 12. Alternatively, after peeling the second protective film 7 from the adhesive layer-attached transparent surface material 1 and bonding the adhesive layer-attached transparent surface material 1 to the display device main body 11, the first protective film 6 is peeled off, and the adhesive layer The display device main body 11 to which the attached transparent surface material 1 is bonded may be bonded to the transparent support 12. At the time of bonding to the transparent support 12, the transparent surface material 1 with the adhesive layer or the transparent surface material 1 with the adhesive layer to which the display device main body 11 is bonded is bonded while being entirely or locally curved. There is. In that case, it is more preferable to bond only the transparent surface material 1 with an adhesive layer to the transparent support 12 first from the ease of curvature.

  On the other hand, there are cases where it is desired to peel off the display main body 11 bonded to the transparent support 12 from the transparent support 12. Also in this case, the bonded product may be peeled while being bent, and the display device main body 11 is first peeled from the transparent surface material 1 with the adhesive layer, and then the transparent surface material 1 with the adhesive layer is from the transparent support 12 It is preferable to peel off. Therefore, the interfacial adhesion between the first adhesive layer 4 and the transparent support 12 and between the first adhesive layer 4 and the transparent surface material 2 is determined by the second adhesive layer 5 and the display main body 11, and the second adhesion. It is preferable to make it larger than the interface adhesion between the layer 5 and the transparent surface material 2. In addition, after peeling the adhesive layer provided transparent surface material 1, the first adhesive layer 4 does not remain on the transparent support 12, and the transparent support 12, that is, the window glass bonds the display device main body 11. It is preferable to be able to return to the previous state. For that purpose, the interfacial adhesion between the first adhesive layer 4 and the transparent support 12 is preferably smaller than the interfacial adhesion between the first adhesive layer 4 and the transparent surface material 2. In order to realize such a magnitude relationship of adhesion, the ratio of the monomer (B3) to the monomer (B4) in the curable compound as the constituent material of the first adhesive layer 4 and the second adhesive layer 5 And the content of the non-hardening component and the chain transfer agent. When the adherend is a glass plate, the interfacial adhesion can be increased by increasing the ratio of the monomer (B3) to the monomer (B4) or suppressing the content of the non-hardening component. Further, the adhesion to the glass surface can be increased by increasing the content of the chain transfer agent.

(Action and effect)
In the transparent surface material 1 with the adhesive layer of the present embodiment, the first adhesive layer 4 for bonding to the transparent support 12 is provided on the first surface 2 a of the transparent surface material 2. The 2nd adhesion layer 5 for bonding the display apparatus main body 11 to the 2nd surface 2b is provided. Therefore, when bonding the display device main body 11 to the transparent support 12, it is not necessary to newly arrange an adhesive or the like on the transparent surface material 2, and the bonding operation of the display device main body 11 can be easily performed.

  Further, according to the display device 10 of the first embodiment, since the light shielding portion 3 surrounding the periphery of the image display area is provided in the transparent surface material 1 with the adhesive layer, the liquid crystal panel is not newly provided. The wiring member etc. connected to 14 can be hidden. In particular, in the case of the first embodiment, since the light shielding portion 3 is provided on the second surface 2 b of the transparent surface material 2, the distance in the depth direction between the light shielding portion 3 and the image display surface is short. Therefore, the display does not look backward with respect to the frame portion formed of the light shielding portion 3, and it is possible to prevent the reduction in the visibility of the display due to the step between the frame portion and the image display surface.

  Instead of the configuration of the first embodiment, for example, the second adhesive layer 5 is formed large enough to cover the light shielding portion 3 in the entire area of the second surface 2 b of the transparent surface material 2. A configuration in which the support member 28 is fixed is also conceivable. However, the shear modulus of elasticity of the second adhesive layer 5 is lower than that of the conventional general adhesive layer in order to facilitate the disappearance of air bubbles generated when the second adhesive layer 5 and the display device main body 11 are bonded. It is adjusted to. Therefore, it is extremely difficult to fix the support member 28 supporting the weight of the backlight 17 by the second adhesive layer 5. In that respect, in the configuration of the first embodiment, the second adhesive layer 5 is formed on a part near the center of the second surface 2 b of the transparent surface material 2 to expose the light shielding portion 3 and support The member 28 is fixed to the light shielding portion 3 by the double-sided adhesive tape 29. As a result, the display device main body 11 including the backlight 17 can be firmly fixed.

Second Embodiment
Hereinafter, a second embodiment of the present invention will be described using FIGS. 5 and 6.
The basic configuration of the transparent surface material with the adhesive layer of the second embodiment is the same as that of the first embodiment, and the surface of the transparent surface material on which the light shielding portion is formed is different from that of the first embodiment.
In FIG. 5 and FIG. 6, the same code | symbol is attached | subjected to the same component as FIGS. 1-4 used in 1st Embodiment, and detailed description is abbreviate | omitted.

  As shown in FIG. 5, the transparent layer with adhesive layer 31 of the second embodiment includes the transparent layer 2, the light shielding portion 3, the first adhesive layer 4, the second adhesive layer 5, and the first protective film 6. , And a second protective film 7. The light shielding portion 3 is provided at the peripheral portion of the first surface 2 a of the transparent surface material 2. The first adhesive layer 4 is provided on the entire area of the first surface 2 a of the transparent surface material 2 so as to cover the light shielding portion 3. The second adhesive layer 5 has a formation area smaller than that of the first adhesive layer 4, and is provided on the second surface 2 b of the transparent surface material 2. The area and shape of the area in which the second adhesive layer 5 is formed are the same as in the first embodiment. That is, when viewed through the transparent surface material 2 from the normal direction of the transparent surface material 2, the second adhesive layer 5 has a region surrounded by the frame-shaped light shielding portion 3 and a part of the light shielding portion 3 and a plane. It is provided over the overlapping area. The structure of the other transparent surface material 31 with an adhesion layer is the same as that of 1st Embodiment.

  As shown in FIG. 6, the display device 32 of the second embodiment includes a display device main body 11, a transparent surface material 31 with an adhesive layer, and a transparent support 12. The transparent support 12 is bonded to the first surface 31 a of the transparent surface material 31 with an adhesive layer. The display device main body 11 is bonded to the second surface 31 b of the transparent surface material 31 with the adhesive layer. Also in the second embodiment, the transparent support 12 is a window glass used, for example, in a store or office, and the display device main body 11 is, for example, a liquid crystal display device. The adhesive layer provided transparent surface material 31 is obtained by peeling the first protective film 6 and the second protective film 7 from the adhesive layer provided transparent surface material 31 shown in FIG. The transparent surface material 2 is bonded to the transparent support 12 via the first adhesive layer 4. The display device main body 11 is bonded to the transparent surface material 2 via the second adhesive layer 5.

  Also in the second embodiment, the same effect as that of the first embodiment can be obtained, such as the ability to easily perform the bonding operation of the display device main body and the reduction in the visibility of the display being suppressed.

  In the second embodiment, since the light shielding portion 3 is formed on the first surface 2 a of the transparent surface material 2, the support member 28 for supporting the backlight 17 is provided on the second surface 2 b of the transparent surface material 2. It differs from the first embodiment in that it is directly bonded. That is, in the second embodiment, the support member 28 is directly bonded to the surface of the glass plate or resin plate constituting the transparent surface material 2 without the light shielding portion 3. Therefore, in the configuration of the second embodiment, the adhesion between the angle 28 and the transparent surface material 2 can be enhanced compared to the configuration of the first embodiment in which the angle 28 is fixed to the transparent surface material 2 via the light shielding portion 3. The reliability of fixing of the display body can be further enhanced.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the present invention.
For example, although the example of the frame-shaped light-shielding part which encloses all 4 sides of a rectangular-shaped transparent surface material as a light-shielding part of the transparent surface material with an adhesion layer was mentioned in the said embodiment, the frame which necessarily encloses all 4 sides It does not have to be in the form of For example, light shielding portions may be used which are arranged along the two opposing upper and lower or left and right sides. Moreover, although the example of the window glass used for a shop or an office etc. was mentioned as a transparent support which comprises a display apparatus, it replaces with window glass, for example, movable members, such as a glass partition which divides indoors, a transparent support The display main body may be pasted to this as.

  Moreover, although a liquid crystal display was concretely demonstrated in FIGS. 3-6 as a display apparatus main body, you may use an organic electroluminescent display, a plasma display, an electronic paper display etc. besides a liquid crystal display. In addition, the shape, the number, the arrangement, the material, and the like of each component of the transparent surface material with the adhesive layer and the display device can be appropriately changed without being limited to the above embodiment.

INDUSTRIAL APPLICABILITY The present invention is applicable to various display devices such as liquid crystal displays, organic EL displays, plasma displays, electronic paper displays and the like, and transparent surface materials with an adhesive layer used when pasting them on a transparent support.
In addition, the entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2013-236910 filed on November 15, 2013 are cited herein as the disclosure of the specification of the present invention, It is what it takes.

  1, 31: transparent surface material with adhesive layer, 2: transparent surface material, 3: light shielding part, 4: first adhesive layer, 5: second adhesive layer, 10, 32: display device, 11: display device body , 12: transparent support, 14: liquid crystal panel, 17: backlight (illumination device), 28: support member (angle).

Claims (14)

A transparent surface material having a first surface and a second surface;
A light shielding portion provided on at least one of the peripheral portion of the first surface of the transparent surface material and the peripheral portion of the second surface;
A first adhesive layer provided on the first surface of the transparent surface material;
A second adhesive layer provided on the second surface of the transparent surface material and provided in a formation area smaller than the area where the first adhesive layer is formed;
Equipped with
An adhesive layer, wherein the edge of the second adhesive layer is located inside the edge of the first adhesive layer and overlaps with the light shielding portion, as viewed from the normal direction of the first surface Translucent material.   The pressure-sensitive adhesive layer-carrying transparent surface material according to claim 1, wherein the first pressure-sensitive adhesive layer is provided on the entire area of the first surface of the transparent surface material. The transparent surface material with the adhesion layer of Claim 1 or 2 whose shear elasticity modulus of a said 1st adhesion layer and a said 2nd adhesion layer is 10 < ² > -10 < ⁵ > Pa. The pressure-sensitive adhesive layer-carrying transparent surface material according to any one of claims 1 to 3, wherein the transparent surface material is a glass plate. The pressure-sensitive adhesive layer-carrying transparent surface material according to any one of claims 1 to 4, wherein the thickness of the transparent surface material is more than 0.2 mm and 2.0 mm or less. The pressure-sensitive adhesive layer-carrying transparent surface material according to any one of claims 1 to 5, wherein each of the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer has a thickness of 0.2 to 2.0 mm. Transparent face material with adhesive layer,
A transparent support bonded to the first surface of the transparent surface material with the adhesive layer;
A display device body bonded to the second surface of the transparent surface material with the adhesive layer;
At least one of a transparent surface material having a first surface and a second surface, a peripheral surface portion of the first surface of the transparent surface material, and a peripheral surface portion of the second surface. Provided on the second surface of the transparent surface material, the first light-shielding layer provided on any one side, the first adhesive layer provided on the first surface of the transparent surface material, and the first And a second adhesive layer provided in a formation region of an area smaller than the formation region of the adhesive layer,
The transparent support is bonded to the transparent surface material through the first adhesive layer,
The display device body is bonded to the transparent surface material via the second adhesive layer ,
A display device , wherein the edge of the second adhesive layer is located inside the edge of the first adhesive layer and overlaps with the light shielding portion when viewed from the normal direction of the first surface. . The interfacial adhesion between the first adhesive layer and the transparent support, and the first adhesive layer and the transparent surface member is determined by the second adhesive layer and the display device main body, and the second adhesive layer. The display device according to claim 7, which is larger than the interfacial adhesion force of the transparent surface material 2. 9. The display device according to claim 8 , wherein an interfacial adhesion between the first adhesive layer and the transparent support is smaller than an interfacial adhesion between the first adhesive layer and the transparent surface material. 10. The display apparatus according to any one of claims 7 to 9 , further comprising a support member fixed to an area other than the area where the second adhesive layer is formed on the second surface of the transparent surface material and supporting a portion of the display device body. Display device described in. The light shielding portion is provided on the first surface of the transparent surface material;
The display device according to claim 10 , wherein the support member is fixed to the second surface of the transparent surface material. The light shielding portion is provided on the second surface of the transparent surface material;
The display device according to claim 10 , wherein the support member is fixed to the light shielding portion. The display device according to any one of claims 7 to 12, wherein the transparent support is one selected from window glass, wall glass, and glass partition. The display device according to any one of claims 7 to 13, wherein the whole area of the image display area in the display device main body is bonded to the transparent surface material through the second adhesive layer.

Images